{"id":8071,"date":"2026-11-01T01:29:52","date_gmt":"2026-11-01T01:29:52","guid":{"rendered":"https:\/\/aspsuperhome.com\/guides\/impact-windows\/what-happens-to-windows-hurricane-no-impact-glass\/"},"modified":"2026-11-05T06:32:24","modified_gmt":"2026-11-05T06:32:24","slug":"what-happens-to-windows-hurricane-no-impact-glass","status":"publish","type":"page","link":"https:\/\/aspsuperhome.com\/guides\/impact-windows\/what-happens-to-windows-hurricane-no-impact-glass\/","title":{"rendered":"Impact Glass Windows in Miami: Hurricane Protection"},"content":{"rendered":"\n
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Impact Windows \u00b7 Miami<\/p>

Impact Glass Windows for Miami Homes That Stand Up to Storms<\/h1>

Learn how impact glass helps protect your home from wind-borne debris and hurricane-season weather, and how ASP Superhome can help you plan the right windows for your home.<\/p>

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By Jonathan Rodriguez \u00b7 Published October 31, 2026<\/p>\n\n

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Standard window glass often breaks into large, sharp pieces when hurricane winds or flying debris hit it. Impact glass windows are built differently. They can crack, but a plastic layer holds the pieces together and keeps the opening covered.<\/p>\n

If you’re researching this for a parent, a relative, or a rental property, this page explains the basics in plain terms.<\/p>\n

What Happens to Standard Glass When a Hurricane Hits<\/h2>\n

Standard annealed glass (ordinary single-layer glass) shatters into sharp pieces when debris strikes it. Nothing inside the pane holds those pieces together. They can fall inward or blow into the home.<\/p>\n

Hurricane wind pressure also changes fast. It rises and falls during a storm. A window can be pushed inward or pulled outward. Palm Beach County Planning, Zoning & Building<\/a> notes that hurricane winds and wind-borne debris can break windows. It also calls strengthening windows an important hurricane-protection measure in Florida.<\/p>\n

The real problem starts with the opening. Once a window breaks, wind and rain can enter the house. That opening is the main way damage spreads. How far it spreads depends on the home’s construction and the storm. So this describes the mechanism, not a fixed sequence of events.<\/p>\n\n

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If a storm is coming or a recent one left a window damaged, we're glad to talk through what impact glass could mean for your home. Talk it through with our team — the first consultation is free, confidential, and carries no obligation.<\/p>

Get a free consultation<\/a><\/div>
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Why a Broken Window Is a Bigger Problem Than the Glass<\/h2>\n

Wind that enters through one broken opening changes the pressure inside the home. That pressure can push on other windows, doors, and parts of the roof. One failure can lead to more.<\/p>\n

Wind-driven rain follows the same path. Water can soak drywall, flooring, furniture, and personal belongings. Some of that damage shows up long after the wind dies down.<\/p>\n

Debris can also injure people inside. That’s why protecting the opening matters most for anyone at home during a storm.<\/p>\n

Fla. Stat. \u00a7 553.844<\/a> covers mitigation techniques for site-built, single-family residential structures built before the Florida Building Code. The Legislature listed “adding or strengthening opening protections” among the windstorm mitigation measures the Florida Building Commission must develop. It also noted that recent hurricanes exposed weaknesses in some construction built before the Florida Building Code (Fla. Stat. \u00a7 553.844<\/a>).<\/p>\n

What Impact Glass Is and How It Holds Together<\/h2>\n

Impact glass windows use laminated glass. Laminated glass has two or more layers of glass bonded to a plastic layer in between. That plastic layer is often polyvinyl butyral (PVB), a tough plastic film.<\/p>\n

When debris strikes, the outer glass may crack. The plastic layer holds the fragments in place. Instead of falling or blowing inward as sharp shards, the pieces stay largely together. The opening stays covered.<\/p>\n

Impact glass is resistant, not unbreakable. It can still crack. It is designed to resist wind-borne debris under tested conditions. The frame and the installation matter too. The window works as one assembly, so a strong glass product still depends on a properly built frame and a sound installation.<\/p>\n

How Impact Glass Is Tested and Rated<\/h2>\n

Impact products are checked against recognized test standards. A Florida Building Code supplement revises the residential protection-of-openings section so that exterior glazed openings in buildings located in windborne debris regions must be protected from windborne debris, with that protection meeting the Large Missile Test requirements of ASTM E1996 and ASTM E1886, TAS 201, 202 and 203, or AAMA 506, as applicable (official supplement text<\/a>).<\/p>\n

Section 553.844(3)(c)<\/a> of the Florida Statutes refers to the wind-borne debris region as defined in s. 1609.2 of the International Building Code (2006). Many coastal South Florida homes may fall in that region. Whether a specific home does depends on its location and design wind speed.<\/p>\n

Products for which the code establishes standardized testing or comparative or rational analysis methods shall be approved by submittal and validation of one of the reports or listings the statute names, indicating that the product complied with the Florida Building Code and is, for the purpose intended, at least equivalent to what the code requires (\u00a7 553.842(5)(a)<\/a>). One of these options, a certification mark or listing of an approved certification agency, may be used only for products for which the code designates standardized testing (\u00a7 553.842(5)(a)1<\/a>.). Other approved routes include an evaluation report from an approved product evaluation entity and a legacy report from a nationally recognized model code organization, if the report demonstrates compliance with the Code (Rule 61G20-3.005<\/a>). Any person who advertises, sells, offers, provides, distributes, or markets a product as hurricane, windstorm, or impact protection from wind-borne debris without approval pursuant to \u00a7 553.842<\/a> or s. 553.8425 is subject to the Florida Deceptive and Unfair Trade Practices Act under part II of chapter 501, brought by the enforcing authority as defined in s. 501.203 (Fla. Stat. \u00a7 553.842<\/a>).<\/p>\n

Doors follow the same logic. Miami-Dade’s Product Control Section approves exterior doors used to protect the building envelope, based on testing and technical documentation (Miami-Dade product approval<\/a>). So an impact door should trace back to a certification mark or an approval report, the same way an impact window does.<\/p>\n

Impact Windows vs. Regular Windows: What Actually Differs<\/h2>\n

Regular windows use ordinary glass, either a single pane or insulated panes. Impact windows<\/a> use laminated glass with a plastic layer, set in a frame tested with that glass.<\/p>\n

In wind-borne debris conditions, the two differ in how the glass breaks. A standard pane tends to break into shards that can enter the room. Laminated glass may crack, but it stays bonded to its plastic layer. This is a physical difference. It is not a promise that an impact window will hold through any particular storm.<\/p>\n

Impact glass is generally heavier and can be thicker than standard glass. That affects frames, hardware, and installation.<\/p>\n

Replacement projects have their own rules. The conditions are these. The windows are installed per the manufacturer’s instructions for the wind zone. They meet design pressure requirements. They are the same size, in the same opening. A copy of the manufacturer’s instructions is submitted with the permit application, in printed or digital format (official supplement text<\/a>). Design drawings submitted for permitting are not treated as a product evaluation report, so plan the permit steps as part of the project.<\/p>\n

Common Questions About Impact Glass Cost and Energy Performance<\/h2>\n

Impact glass costs more than standard glass because it uses laminated layers and tested frames. The cost also varies with the size, number, and type of openings. Miami-Dade’s hurricane guidance<\/a> notes that impact-resistant glass has both capabilities and cost-related considerations.<\/p>

Is unbreakable glass expensive?<\/summary>

Impact glass costs more than standard glass. It resists breakage, but it is not unbreakable.<\/p><\/details>

Is .27 a good U-factor for windows?<\/summary>

U-factor measures how much heat passes through a window. Lower numbers mean less heat moves through the glass. Whether 0.27 suits a home depends on its climate and design.<\/p>\n

Impact glass can also pair with energy-efficient coatings and interlayers. That makes it sensible to review wind and thermal specifications together.<\/p><\/details>\n

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Not sure what your next step is?<\/h3>

Talk it through with our team — the first consultation is free, confidential, and carries no obligation.<\/p>

Get a free consultation<\/a><\/div>
Get a free consultation<\/a><\/div><\/div>\n<\/div>\n\n
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Talk Through Your Home’s Openings With Our Team<\/h2>\n

A storm may be forecast, or a recent one may have cracked a window or left an opening exposed. The decision in front of you may feel urgent. You may be asking on behalf of a parent, a relative, or a tenant. You don’t have to sort through the glass, frames, and permit questions alone.<\/p>\n

ASP Superhome offers a free first consultation. It is confidential and comes with no obligation to continue. Reach out through our contact page<\/a> to talk about impact windows or impact doors<\/a> for your home.<\/p>\n\n<\/article>\n